Tamper attachment for truck wheel



Jan. 7,- 1958 J. M. KENNEDY m 2,318,791 i TAMPER ATmcmmT Fox frucx WHEEL j l :filed Feb. 1, 1954 .2 sheets-sheet z i lflnlllilllll' United States Patent v'l'hisjnvention relatesfto improvementsfin-ftampersmn :hasneferenceftoan attachmentfforftrucks.

lhe main :or ,arterial `highwayswot"v this ,country ;are `pliactitratlly .all ,paved eithertby .an asphalt-,containing mixtureor ybyconcrete. 'Eher asphalnpavingrluecto its lo.wer Least :is .extensively .employed Ifor -froad pavements and for :the .paving,.of city .streets Asphalt .pavements for .various lreasons lhave. weak spots ,that '.soon break.. :and Amustibe'fpatclied.' l{Thefedgesofrthe.paxternentfareusually the first to deteriorate. :When :breaks o ccuriinsasphalt .pavements .they must be patchedf-byffr-st ,removingothe .crumbled .paving material :landcleaning zand itainpingathe afoundation lsurface, .after which fresh lpavi-ng vm-terial -is depositedand .-spreadxso as to `:lltthe cavityorfopening. new.. paving material xmust .be jhighly 'compressed in .order y.-to .produce .a :lasting patch and this is generally eected by running the wheel or wheels of atheavy .-truk tbaok and (forth over .the patch. "Whereethe material ,1:eplace;lV coversa .suflicient area ,to awarrant'fitfheax/.y :road JZQllersfare employed. "Where :there arev .one 'orvtmore .separated .patches ,of :.small area ithe material is either damped .'by 'hand Jor fit vis 4compressed :hy Irunningwthe tigear .Wheels 'shack andzforth .over the tpatch. Tghe vmost satistfactony resultsare attained thy tanipjng whichtfis etected by heavy manually yoperated tampers or by tamper'snope ierated .by internal cornbustionngines.

-`Sineernost patching :jobs areaspacedrfarapart land-are .comparatively small it iis not Jpractical .tosernploy @heavy highway rollers. t i f "It .is'the .object of invention-v to produce a :tamper in tthe iform .offan attachment'to the ordinary highway trucks, so constructed .and arranged-that `it'wiflllbe driven Atl1y`1botwerlderived `from va rear Wheel driven-Wheels 4of'the truck .inrsuch .3, manner :that it willdelive-r 4'a series lof tamp'ingstrokes in quick successioinwhent-hetruck moves neither-direction. v t

A further .Objectis to'prpvide atanrnper-` attachment' of a simple and l s 1`1bs`tantia`l construction andfof isucl'ru design'jthat i'tlcan be 'appliedl to and ,removed from a hielvtey truck with .the 'expenditure .0f @comparatively stisllameant Qf @maand etten. 11,1? aber@ and .any .other objects that .may become .apparent ,or .to which'attentior may .be Qalled las .Incideerstton proceeds.. .e attained .by 'memset assura-uctiQn' ,and .an arreaaement .of parts that will AVnew vlie-erlebad IA-detail, liar Whichrtlrpcse referenze will new s1 tothe asssmpanyns drawings-.in which.- 'Fleurs .1 shows side elevation of anoadisaw highway im.lehowiag-tltqaestisa @if devise whenfiaalsehy full tisse aad-.when :not in fuse, by 'brekenlinesy t Figure 2 is a vertical section taken on line 2 2, Figure 3;

Fiture 3 is@ ,Side elevational v-.iewlcokng inthe direction otlarrow. 3 in Figure 2; y

Figure'4`is a' front elevational View looking rearwardly in the direction of arrows 4 in Figures l and 3;

Figure 5 is a section taken on line 5 5, Figure 3 5 Z ,8 l 8 ,7 9 l "Patented J an. .7, .1958

YFigure 6,*is :amenlarged'view showing theupperiiend ofthe attachment;

Figurey is ,asideelevati'onalView showing thejguide plate.l sc eparatedfromy the. rest ofthe device;- and Figure ,8 is Ya 4,section taken. on line .8-8, :Figure 3.

Referringtnow to .the drawing, `reference numeral 1.0 designates a truck of the ordinary kind used in highway Lepailtlldesiguates; the. right hand: siderear drivewheels, .and.l2. desi gnateslthetampingattachment.in its entirety. Injgllllesl,,3 and .A yonly the rear `drive wheels andzva prtnroftthe truck bodvlhave been, shown. vThe .wheels have been shown as dual-and.' have bothbeen .designated hy` numeral,11. '.Numeral 13 designates a portion .of ,therear axle housing.V Attachedto the outer of the dual wheels is.\a n internal ring gear vwhose toothed rim "has vbeen ,designated numeral 14. The ,manner in which the internltgear'is attached to the wheel varies with the construction of the wheel, but 'in Vthe drawing 'the'internLfiIlgearis provided with inwardly ranging vlspokes 15,that"join`it'to acentral'hub`16. Bolts 17 secure jthe'jinternal gear to fthe wheel as shown most clearly nFigure "2. A stub shafft18 projects outwardly from hub 6 and -is held rigidlyintconcentric'axial `position by )at/"plurality of'braces 19. The plane oft'ne ring v*gearis preferably vpositioned close to but v'outside of `4the outer planeofthetire as shown-'in `thefdraw'ing I The outerend of-shaft'i serves-as al support fdrthe remaining -parts of the attachment. An elongated Asupfport and'guide member 201is-provide`dwithahub 21that servesas--a bearingifor-sha'ft 18. Awasherand pin 12.2 Iholds +the-guide Arnernler yin Vposition fon shaft 18;'- 'The upper-end .of guide-mernber "20 is A'providedwith la blt slot Zlwhichf receivesthe sholt `24 that projects l"from =the truok"body. IGlii'de lplate 20 iis'fprovided on'fthe-fins'itie f-withy ithe hub to which :attention has -alreaxiyfbeen v'called and "has ltwotlongitudinally spaced 'longitudinal openings Z5-:and '.26 that 'are :separated by sa as ecti'on '17 from the Arear'or inside isurface of wwhichhub Ztltprojeot's. .'Hole IBS is in'feommunication vwithfthepeningi in hubll -asshown in xFigurefZ. 'Gu'ide..plate`1t20;:asfshown; tis :formed frommwo .pants that :are conneatedfb,I rilundlrods '29-ftha-t: are .'surroundedby ,helical compression springs '30.- `llhetendstofzrodsl arefsenuretltto thelgui'deiplate .hy-any suitable means and :must the :separable romtthe enla'teat one fend to; permit :replacement fafa .spring fshould dt ibreak; the lspecific :connection has not been tshown. #Plate d20 :has :two :lateral projections ,3i :and '.32 toa-which freferenae v:vs/ill ilse-made sherelinafte1;. .The vlower tends ler theflower .Section-.terminate in sections .of reduced-(diameter Vtor-the reception o1helical zspnings2r3- .A :bar :B .is remos/.ably :attaeherlxto .said reduced ltends :and iforms .an abutment tor :springs .83. Slildable inaeaeh Eef the .openjngs 125, .2.6 .-is across fhead v,comprising ttwo :blocks 34 and showninligure. A bar L3.6 lis .attached tofsth cross .heads thy bolts .31. ,The @cross :heads :are splaoedfasfshownfin `Figure Beso thatwhenthe Vlower cross lhead rests 'onl springs` `33; .the univer cross -head will .be .engagedahy-.the .lcwersends-of s pringsb. Attached .to the lower end yof bar 36 is a tampenhead Bisutllatprojete belowme Lower-most .point of .the wheel .peripheries as shown@ Figures 2, ,3 .and,4.. c

.Since this .machine is designed to eftect .a tamping Qf the materalused .fior .repairing paiements, it, isneces.- sary` tp 1 provide means @for `.recipiocafng the -tarnper .and this Will .now he described. ,Attention .has been. .called to projections 31 'and 3 2 .and t0 ,the hubthat-.extendsin- Wardly from projection 31. Qn the outside; D'LpLojecfgnlfazhub has been `shown. ",lh ,twofhilhs'form abea'ring for a' shafttoV the Ainner end of which pinion 40 lis attached. A crank, arm or disk 41 is attached to the outer end of said shaft. Since pinion 40 is in mesh with internal gear 14, as shown in Figures 3 and 4, it will turn in the same direction as the wheel when the truck travels.

Referring now more particularly to Figure 6, it will be seen that bar 36 is provided near its upper end with an elongated opening 42 and that a detent 43 is attached to bar 36 by a pivot 44. The detent has an extension 45 that projects up beyond pin 46, which is attached to plate 20, when bar 36 is in its lowermost position, as shown.

A compression spring 47 is positioned between extension 45 and abutment 4S and normally holds extension 45 in engagement with pin 46. When the parts are in the position shown in Figure 6, the lower end of the detent covers the opening 42. When bar 36 is moved upwardly until cam 49 passes pin 46 the detent turns in a clockwise direction and removes the obstruction of opening 42. A lever 49 is pivoted at 50 to projection 32. The longer arm terminates in a pin 51 that extends into opening 42. A rod 52 has its lower end connected to the crank pin on disk 41 and its upper end connected by pivot S3 to the outer end of lever 49. It is now apparent that when the truck travels, crank disk 41 turns and lever 49 rocks about pivot 50. It is evident that the radius of the circle described by the crank pin on disk 39 must be so related to the distance between pivots 50 and 53 and the distance between pivot 50 and pin 51, that the latter will move the desired distance. Since the drawing has not been made to scale, the re1- ative distances shown may not be strictly correct.

Let us now assume that the truck wheel is turning in the direction of the arrow in Figure 3. Crank disk or arm 41 will turn in a clockwise direction, as the crank pin moves downwardly from the position shown in Figure 3, lever 49' will rock about pivot 50 in a clockwise direction and pin 51 will engage the detent and raise bar 36 and the upper cross head H and this will compress springs 30 which have been shown excessively large for purpose of clearness. When cam 49 reaches pin 46 the detent will begin to turn and when its lower end moves a sutcient distance towards the left it permits pin 51 to pass and when this occurs, bar 36 will be impelled downwardly by the action of gravity and springs 30 and the tamper head 38 will strike the pavement a powerful hammer blow. Attention is now called to springs 33 that are positioned to be engaged by the lower cross head on the downward movement of the tamper. Springs 33 serve as buers and are of such strength that they will return the parts to such a position that the bottom of the tamper will be positioned above the level of the pavement so that the parts can move along the road. By properly selecting the strength and length of springs 33, they will perform this function without materially reducing the force of the impact blow. After the crank pin has passed its lowermost position and begins its upward movement, lever 49 begins to turn counter-clockwise and finally reaches the position shown in Figure 6 completing a cycle. The operation is the same whether the truck moves forwardly or rearwardly and by alternating the movement of the truck, a repair patch can be quickly and thoroughly tamped.

It is, of course, desirable to operate the tamper as fast as practical and the gear ratios must therefore be selected to obtain the optimum operation.

When not in use the attachment can be disconnected from the wheel and held in the dotted line position shown in Figure 1, or it may be transported in the truck body.

It is obvious that various changes may be made from the structure shown without departing from the invention as delned in the appended claims.

What is claimed as new is:

1. A tamping device for attachment to a highway re- 4 pair truck, comprising a guide plate for attachment to the truck body in a vertical position, a tamper bar mounted on the guide plate for vertical reciprocation, means comprising vertically spaced cross heads carried by the tamper bar and cross head guides on the guide plate for guiding the tamper bar, andmeans for raising the tamper bar and for releasing it at the top of its movement for downward movement, lsaid means comprising a crank shaft mounted on the `guide plate for rotation about an axis perpendicular to the guide plate, a crank disk attached to the front end of the shaft, a lever of the lirst class mounted on the guide plate adjacent its top for rocking movement, the inner end of the lever having a lost motion connection with the tamper bar, a rod interconnecting the outer end of the lever with the crank whereby when the crank shaft turns the lever will rock about its pivot, means comprising a pivoted detent carried by the tamper bar at a point above the lever for effecting a releasable connection between the inner end ofthe lever and the tamper bar, whereby the tamper bar will be raised when the inner end of the lever moves upwardly,

-means comprising a stationary cam follower on the guide vbar and a cooperating cam surface on the detent for moving the latter to bar releasing position when the inner end vof the lever reaches the top of its movement, and motion transmitting means for turning the crank shaft by power derived from a truck drive wheel, whereby the tamper bar will be reciprocated as the truck travels.

2. A device in accordance with claim 1 in which helical compression springs are attached to the guide plate at a point above the upper cross head in position engaging the cross head when the tamper bar is raised to its uppermost position whereby when the tamper bar is released by the detent it will be given an initial downward acceleration by said springs.

3. A device in accordance with claim 2 in which at least one spring is operatively associated with the lower end of the guide plate at a point below the lower cross head in position engaging the latter when the tamper approaches the lower end of its downward movement, said spring serving as a buffer and functioning to return the tamper bar to a point above its extreme lowermost position.

4. A device in accordance with claim 3 in which means is provided for supporting the device in a fixed relative position with respect to one of the rear drive wheels, comprising: a short stub shaft in axial alignment with the wheel projecting outwardly therefrom, bearing means in the guide plate to receive the stub shaft and an adjustable connection between the lguide plate and truck body.

5. In a tamper adapted to be suspended from the body of a highway truck, comprising a guide plate having vertically separated guides, a crosshead in each guide and mounted for reciprocation, a tamper. bar attached to both crossheads holding them in :spaced relation, means comprising a crank shaft provided with a crank, a lever of the first class having one end connected with the crank by means of a rigid rod, a pivot carried by the guide plate about which the lever rocks, the other end of the lever lapping the tamper bar, a detent pivotally connected with the tamper bar, means comprising a spring operatively associated with the detent for normally positioning its lower end above and in contact with the outer end of said lever whereby when the latter moves upwardly it will raise the tamper bar, and means comprising a pin projecting from the guide bar, and a cooperating cam surface on the detent for moving it out of engagement withthe lever when the tamper bar has been raised to a predetermined height to permit it to return to its lower position.

References Cited in the le of this patent UNITED STATES PATENTS 2,659,281 Lucas ;..A Nov. 17, 1953 

